
<h1><span class="yiyi-st" id="yiyi-12">numpy.ptp</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ptp.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.ptp.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.ptp"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">ptp</code><span class="sig-paren">(</span><em>a</em>, <em>axis=None</em>, <em>out=None</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/core/fromnumeric.py#L2155-L2197"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">沿轴的值范围（最大 - 最小）。</span></p>
<p><span class="yiyi-st" id="yiyi-15">函数的名称来自“峰到峰”的首字母缩写。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-16">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-17"><strong>a</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-18">输入值。</span></p>
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<p><span class="yiyi-st" id="yiyi-19"><strong>axis</strong>：int，可选</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-20">用于查找峰的轴。</span><span class="yiyi-st" id="yiyi-21">默认情况下，展平数组。</span></p>
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<p><span class="yiyi-st" id="yiyi-22"><strong>out</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-23">用于放置结果的替代输出数组。</span><span class="yiyi-st" id="yiyi-24">它必须具有与预期输出相同的形状和缓冲区长度，但如果需要，将转换输出值的类型。</span></p>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-25">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-26"><strong>ptp</strong>：ndarray</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-27">保存结果的新数组，除非指定<em class="xref py py-obj">out</em>，在这种情况下将返回对<em class="xref py py-obj">out</em>的引用。</span></p>
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<p class="rubric"><span class="yiyi-st" id="yiyi-28">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span><span class="o">.</span><span class="n">reshape</span><span class="p">((</span><span class="mi">2</span><span class="p">,</span><span class="mi">2</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span>
<span class="go">array([[0, 1],</span>
<span class="go">       [2, 3]])</span>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">ptp</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="go">array([2, 2])</span>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">ptp</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="go">array([1, 1])</span>
</pre></div>
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</dd></dl>
